вычислить (tg a-tg b)* ctg(a-b)-tg a* tg b плиззззз!!!)))
=(sin(a+b)/cosacosb)((ctgactgb+1)/(ctgb-ctga)) - tgatgb=(ctgactgb+1)tgatgb-tgatgb=tgatgb(ctgactgb+1-1)=tgatgbctgactgb=1
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=(sin(a+b)/cosacosb)((ctgactgb+1)/(ctgb-ctga)) - tgatgb=(ctgactgb+1)tgatgb-tgatgb=tgatgb(ctgactgb+1-1)=tgatgbctgactgb=1